Alex, this shows different part no:
http://parts.johnleenissan.com/p/Nissan_2005_350Z-35L-V6-Automatic/CRANKSHAFT-POSITION-SENSOR-Crnkshft-sensor-Engine-Crankshaft-Position-Sensor/49552070/23731AL60C.html
Says 5 AT as well.
Very unlikely at that price, but I'll look into this for you.
That's what you need, correct?
http://www.torqen.uk/350z/exhausts/test-pipes/2525-350z-hr-motordyne-advanced-resonance-tuning-art-test-pipes-md-001.html
I think both auto and manual are the same, let me check. Have a look here for now:
http://www.torqen.uk/search?controller=search&orderby=position&orderway=desc&search_query=23731&submit_search=